Tokamak Vacuum Vessel Replacement Through Segmented Robotic Maintenance
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Solution Overview
Problem
The removal and replacement of components, particularly the vacuum vessel, from a tokamak is challenging due to neutron activation and radioactive contamination, requiring complex and risky manual operations.
Innovation Solution
A method is provided for automatically removing and replacing components by splitting the tokamak into portions, rotating and transferring the vacuum vessel onto a platform, and rejoining the tokamak using robotic assistance to minimize human exposure and mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual operations are used for component removal and replacement, then flexibility and adaptability are maintained, but safety risks increase due to neutron activation and radioactive contamination
Solution Approach 1:
The patent replaces manual mechanical operations with an automated robotic system. The robotic manipulator performs component removal and replacement tasks that would otherwise require human operators to work in radioactive environments, thereby eliminating direct human exposure to neutron activation and radioactive contamination while maintaining operational capability through automated control systems
Solution Approach 2:
The robotic system acts as an intermediary between the operator and the radioactive environment. The manipulator arm and associated end effectors serve as the intermediate mechanism that handles activated components, allowing operators to control the process remotely without direct contact with hazardous materials
2Ease of operation
If the tokamak is split into portions for maintenance, then component accessibility is improved, but device complexity increases
Solution Approach 1:
The tokamak vessel is divided into multiple separable portions or modules. This segmentation allows the robotic system to access and manipulate specific components by moving individual sections, improving accessibility to previously hard-to-reach areas while enabling maintenance operations on modular units rather than the entire system
Solution Approach 2:
The tokamak structure incorporates dynamic, movable sections that can be opened or reconfigured during maintenance operations. This dynamic design allows the system to transition from a closed, fixed configuration to an open, accessible configuration, enabling robotic manipulation of components without requiring complete disassembly
3Reliability
If automated robotic systems are used for maintenance, then safety is improved by reducing human exposure, but device complexity and initial cost increase
Solution Approach 1:
Complex manual operations are replaced with a programmable robotic system that uses sensors, actuators, and control algorithms to perform maintenance tasks. The robotic manipulator incorporates force feedback, vision systems, and automated path planning to handle delicate component removal and replacement operations that would be difficult or dangerous for humans
Solution Approach 2:
The robotic system incorporates self-adjusting mechanisms and automated control that allow it to adapt to varying component geometries and maintenance requirements without constant human intervention. The system can autonomously navigate, manipulate components, and even perform preliminary assessment of component conditions, reducing the need for complex external control infrastructure
Data Source
AI summary
Techniques are described for automatically removing and replacing components, including a vacuum vessel, from a tokamak. The inventors have recognized that schemes for automatically removing and replacing components from a tokamak should preferably be simple (e.g., using proven equipment to perform a series of non-mechanically complex tasks) and have a very low risk of damaging components. Techniques described herein may include splitting a tokamak into multiple pieces, separating the pieces, and removing the now separate pieces of the vacuum vessel from within the pieces of the tokamak. A new vacuum vessel can be inserted in multiple pieces and the tokamak rejoined to complete the replacement process.